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Repair rear axle, 90 K1500 Sub

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Foy, Dec 21, 2003.

  1. Foy

    Foy Registered Member

    Oct 28, 2002
    Likes Received:
    Raleigh, NC
    My 90 half ton Sub, stock, daily driver, non-trail rig, 185,000 miles, is doing some serious whining from the rear end, especially when cold. We're wondering if we need to adjust or replace the rear end gears (they're original).

    If we replaced parts, we'd probably want to go back with the same gears, Gov Lock, and such.

    The question is: is a case spreader needed to pull the carrier on the stock 10 bolt? Can this be done on the truck, or is it necessary to pull the assblbly and work from the bench? Are the rear axle bearings lubed from the gear oil, or should we assume we need to pull them and replace or repack?

    Guess we could find a replacement 10 bolt, do the bench work, and install the whole piece, too, if need be.

    Any advice appreciated.

  2. dyeager535

    dyeager535 1 ton status Premium Member

    Dec 13, 2000
    Likes Received:
    Roy WA
    The only special tool needed for pulling any parts is a bearing puller.

    You aren't going to "adjust" the rear gears, perhaps a few parts are worn out, but you will set the gears back up as close to correct as possible. (hard to get a "new gear good" pattern with used gears)

    If you haven't ever done this before, and haven't really researched it, you may want to reconsider. It will involve a few assemblies/disassemblies to get everything right, involves setting up the pinion with proper preload, etc.

    Usually a lot easier and cheaper to find a used axle and just swap it over, especially if a stock axle works fine for you.

    Don't get me wrong, I'll never tell someone they CAN'T do something themselves, but setting up gears correctly takes time and patience, (a lot of both most times) which may be more than you realize if you've never tried to repair a rear axle before.
  3. Confedneck

    Confedneck 3/4 ton status

    Nov 1, 2002
    Likes Received:
    Lehigh Acres, Florida
    sounds like carrier bearings as a possibility..
  4. slider

    slider 1/2 ton status

    May 7, 2001
    Likes Received:
    Whidbey Is. Washington
    Dorian pretty much hit it on the head. with that many miles you should get a new gear set and remove the glov lock and replace it with a limited slip. The glov locks are well known for blowing up, thats my opnion and I'm sure others will agree and I would bet its worn out anyway. If you cannot preform the work a good differential shop can do the work in about a half a day.

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